Improvement in caster-frames for sewing-machines



B. P. STARK. Ogu-ster-Prame for S'ewing-Maqhine.

No. 203,789. Patented May 14,1878,

Inv ant cur.

UNITED STATES PATENT OFFICE.

BENJAMIN F. STARK, OF WEST NEWTON, PENNSYLVANIA.

IMPROVEMENT IN CASTER-FRAMES FOR SEWING- MACHINES.

Specification forming part of Letters Patent No. 203,789, dated May 14,1876 application filed March 26, 1878.

To all whom it may concern:

Be it known that I, BENJAMIN F. STARK, of West Newton, in the county ofWestmoreland and State of Pennsylvania, have invented certain new anduseful Improvements in Gaster-Frames for Sewing-Machines; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit pertains to make and use it, reference being had to the accompanyingdrawings, which form part of this specification.

My invention relates to an improvement in caster-frames forsewing-machines; and it consists in the arrangement and combination ofparts that will be more fully described hereinafter, whereby the blockswhich unite the arms together also act as journals for theconnecting-rods.

The accompanying drawings represent my invention.

A represents two arms, provided at their inner overlapping ends withlongitudinal slots at. Through these slots passes a screw-bolt, r, intothe block b, which block supports the slotted ends of the arms A. Theouter ends of the arms A are formed for the reception of the feet of thesewing-machine, and support its weight when in operation or standingstill.

The plate 0 on the outer ends of the arms A is removable to admit thefeet of the sewing-machine, and, when admitted, to confine them to theirplaces. The screw-bolt T, when loosened, allows the arms A to beadjusted to the width of the sewing-machine, and when screwed. downprevents any disarrangement of these parts.

To the inside of the arms A are pivoted the bars B. These bars areslotted at their inner ends, which pass alongside of .each other, and,by a bolt through the slots of both, held loosely together, so as toallow them to be extended or shortened with the arms A, to suit theoccasion. Under the extremities of the bars B are secured the casters.As long as the machine remains in one position, or while it is operated,its weight rests entirely upon the ends of the arms A, and the castersremain Connecting the arms A are the bars 0, pivoted in the blocks 12,in. which they may be made to turn until checked by the shoulder a.These bars 0, slotted at their inner ends, are also held together by abolt passing through the slots, in a manner to allow such adjustment asmay be required. Each one of these bars 0 is provided with a lifter, J,placed under the inner slotted ends of the bars B, which ends, when thebars 0 are turned until checked by the shoulder t, are raised up by thelifters and held by them in that position.

In order to turn the bars 0, a crank, F, is applied to one of its outerends and secured under the projection 41. on the outside of one of thearms A.

The efl'ect of elevating the inner ends of the bars B would be todepress the outer ends; but, as these rest upon the floor, they cannotyield; consequently the inner ends must rise the higher, and they beingpivoted in the blocks b, to which the arms A are bolted, on which thesewing-machine stands, all are raised together, and their weight whollythrown upon the casters.

I am aware that bars or rods pivoted together at their inner ends andprovided with casters at their outer ends are old.

Having thus described my invention, I claim-- 1. In a caster-framevforsewing-machines, the blocks b, which serve to unite the two arms A, andserve as journals for the rods 0, in combination with the bars B,substantially as shown.

2. The combination of the slotted rods 0, provided with the lifters .J,blocks l2, bars B, arms A, slotted at their inner ends, bolts 1", andcrank F, substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my. handthis 20th day of March, 1878.

F. A. LEHMAN'N, T. F. LEHMANN.

